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Majority of recent large-scale blackouts have been caused by voltage instability. This paper proposes new algorithms and implementation principles of an intelligent emergency control based on machine learning models and decentralized adaptive models that can effectively prevent voltage instability before they lead to major blackouts and overall collapse of the system. The proposed algorithms have...
Planning the long-term expansion of a power sector requires anticipating future technologies, fuel costs, and new carbon policies. Many state-of-the-art models rely on exogenous data for cost and performance projections where the inherent uncertainty is either ignored or addressed only with sensitivity analysis and scenarios. For the few models accounting for uncertainty, the transition from the research...
To deal with the uncertainty rising with high wind penetration, it is technically and economically important to consider reserve provision by wind generation (WG). Storage could mitigate the WG volatility, so reserve provision by combination of WG and storage could be more competitive in reserve market. This paper presents a new unit commitment (UC) model, in which both WG reserve opportunity cost...
Microgrids (MGs) have been receiving more and more attention, as it can environmentally and reliably integrate intermittent renewable energy sources (RES). Conventionally, an islanded MG is controlled and optimized in a hierarchical strategy, i.e., primary droop control, second automatic generation control (AGC), and tertiary economic dispatch (ED). ED has large time-scale while AGC has small time-scale...
Load dynamics has a substantial impact on transient stability of a power system, but has not been properly treated in transient stability-constrained optimal power flow (TSCOPF) problems. This paper performs a systematical study of the impact of dynamic load models on the TSCOPF problems. First, based on the extended equal-area criterion (EEAC), the feasibility of the reported TSCOPF solutions in...
With the development of large-scale offshore wind farms and floating photovoltaics farms, multi-terminal HVDC systems have drawn significant attention in interconnecting the renewable energy to the main HVAC grid. It becomes increasingly important to consider the injection of the offshore renewable generation into the main HVAC power system in the economic operation. At the mean time requirements...
Solid state transformer (SST) has the advantage of small size, high power density and low noise, which made it possible to use SST in shipboard power system (SPS). Due to the existence of various complex loads and poor working conditions, voltage instability and harmonic problems are caused inevitably in SPS. Amid at these problems, a new modular multilevel type SST (MMC-SST) based topology of SPS...
The goal of this paper is to provide a fast and effective restoration scheme after a fault happened in a distribution network. Many centralized strategies have been proposed to address this multi-objective problem, while in this paper, we present a proper function-decoupling approach by multi-agent system (MAS) to search the optimal restoration solution. The proposed three-layer agent framework decouples...
Mid-long term load forecasting is the prerequisite of power system planning. This paper first introduces the sub-area partitioning of power grid in Nanjing core area. Then the influences of social-economic factors to mid-long term load are studied by two ways, which are correlation analysis method and multiple linear regression analysis method. Based on the analysis results of the two methods, a grey...
Hierarchical and partitioned means of present voltage control results in the coordination problem among multiple coupling zones. From the perspective of game theory, split zones are regarded as game players in order to develop an individual rationality based cooperative game model, in which players search efficient alliance to improve their control effect. Players in the same alliance have a common...
to analyze a smart distribution power system network, a conventional power flow technique has to be improved regarding an operation of distributed generation and a new distribution grid concepts. Therefore, an asymmetrical 3-phase 4-wire power flow using hybrid calculation is selected. Originally, the hybrid technique is developed for a decoupling power flow analysis. However, using hybrid technique...
in the large-scale receiving systems, considering the actual power grid operation condition and load characteristic, this paper introduces the voltage sag as stability considerations object. Take STATCOM as an example, this paper evaluates voltage sag based on quality engineering theory, describing the economic loss caused by the voltage sag and takes it as a cost model of voltage instability. Single...
With an increasing number of controllable distributed generations (DGs) integrated into active distribution network (ADN), the real-time transmission capacities of communication network and computational capabilities of the control center face enormous challenges. To solve this issue, this paper presents a distributed optimal scheduling method based on consensus algorithm, which has a lower requirement...
With widely utilization of distributed generations (DGs) and demand response (DR), the active distribution network (ADN) becomes a more proactive and strategic consumer in electricity markets to procure its energy needs at the minimum cost. Under this background, this paper proposes a bi-level trading model for a strategic ADN to minimize its operation cost in the day-ahead market. The upper level...
Load serving entities (LSEs) purchase energy from markets and sell it to their customers. As a profit-seeking organization, the aim of the LSE is mainly to make the profit maximal. As the electricity market is liberated, consumers become active to participate in it and may decide to modify the profile of their demand to reduce their electricity costs, which affects strategies of LSEs. Hence, demand...
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